Canon Patent for 70-300mm f/4-5.6 Lens

Egami (translated) spotted another patent filed by Canon.

The patent refers to a 70-300mm f/4-5.6 lens. As Egami notes, it’s a bit early for a replacement of the EF 70-300mm F4-5.6L IS.

Patent description (machine translated):

• Patent Publication No. 2014-186098
  • Published 2014.10.2
  • Filing date 2013.3.22
• Example 4
  • Zoom ratio 4.02
  • Focal length f = 72.20-135.09-289.98mm
  • Fno. 4.19-4.63-5.86
  • Half angle ω = 16.68-9.10-4.27 °
  • Image height Y = 21.64mm
  • Overall length of the lens 183.25-214.28-237.12mm
  • BF 43.12-49.21-66.05mm